Spectral changes in inhomogeneous media depending on the spatial coherence of the source can be described by a quasi-optical approach. Assuming a Gaussian-Schell model source the spectral changes are described by using a ...

Changes in the degree of polarisation are described by a single Mueller matrix. Both the monochromatic and quasimonochromatic cases are discussed. The authors show how the propagating degree of polarisation depends on the ...

This paper discusses the potential of using vision systems to monitor and control arable farming operations. Several examples, predominately concerned with the detection of weeds in crops, that have been or are being ...

Links between the fractal Hausdorff dimension, the Fourier transform of two-dimensional scenes, and image segmentation by texture are discussed. It is shown that the fractal Hausdorff dimension can be derived by integration ...

X-rays have not yet been used to their fullest potential in a range of application areas, especially the agricultural and food industries. As a sub-surface technique, X-ray radiation can give three-dimensional information ...

This paper addresses the problem of detecting bruises on peaches and apricots using machine vision. Bruises were created in a controlled manner on freshly harvested sample fruits. The spectral reflectance characteristics ...

Experimental results are presented for the changes in the degree of polarization upon propagation in the LP(01) mode in a few-mode optical fibre. The dependence on the temporal coherence of the source is shown. The general ...

In order to implement robotic milking it is necessary to automate the inspection and cleaning of cow teats prior to milking. This paper assesses the potential of detecting manure on teats using information from a colour ...

X-rays that are elastically or inelastically scattered from a sample provide valuable information about the internal characteristics of a sample such as the molecular structure, density and atomic number. Also since the ...

Xray imaging is a well established technique of detecting strongly attenuating materials and has been applied to a number of inspection applications within the agricultural and food industries. However, there are still ...

No absolute certainty can be given for information derived from images. In most cases image analysis uses single algorithms, or multiple single algorithms' results which are combined in an ad hoc manner, to derive certain ...

There are many applications within the agricultural, food and medical sciences where it is required to detect targets that absorb X-rays in a similar way to the background material and these are therefore not easy to detect ...

The use of spectral information for the discrimination of crops and weeds is reviewed, discussing research results covering most of this century. This includes discussions about the modelling of reflection from vegetation ...

Computer-aided mammographic prompting systems require the reliable detection of a variety of signs of cancer. In this paper we concentrate on the detection of spiculated lesions in mammograms. A spiculated lesion is typically ...

Quality control in mammography is based upon subjective interpretation of the image quality of a test phantom. In order to suppress subjectivity due to the human observer, automated computer analysis of the Leeds TOR(MAM) ...

A novel method to obtain point correspondence in pairs of images is presented. Our approach is based on automatically establishing correspondence between linear structures which appear in images using robust features such ...

We describe methods for detecting linear structures in mammograms, and for classifying them into anatomical types (vessels, spicules, ducts, etc). Several different detection methods are compared, using realistic synthetic ...